136 Proceedings of the Royal Society of Victoria. 



Third, Fourth and Fifth pairs of Pleopoda. — I shall describe 

 these together. The propodite of each is subequal in shape 

 to the preceding one with the addition of a swelling on 

 the inner surface of each, which is most marked on the third, 

 appearing there as a bluntly rounded prominent tubercle clothed 

 with short setse. There is no so called epipodite, as shown by 

 Chilton to exist in Phreatoicus, and also by Spencer and Hall in 

 Phreatoicopsis. 



The endopodite of each is broader and shorter than the second, 

 the fourth is shorter than the third, and the fifth very much 

 shorter than the fourth. In other respects they are similar to 

 each other. The exopodite of each becomes gradually broader and 

 shorter than its antecedent, but in general contour and disposi- 

 tion of setae they are similar to the second. The accessory lobe in 

 each becomes shorter in a similar way and degree as in the 

 endopodites. 



The Uropoda (Fig. 14).— The uropoda point distally and are 

 very strongly developed. The peduncle stretches considerably 

 beyond the end of the telson ; its lower margin is straight and 

 sparsly setose, the upper margin is bluntly serrated, and bears a 

 few short seta3. The outer ramus is equal in length to the 

 peduncle, and arises from above the insertion of the inner ramus; 

 in shape it is styliform, terminating in a strong acute point, at 

 the base of which arise, on the upper and outer surfaces, 

 numerous very long spinose setaj, which project backwards and 

 outwards. The inner ramus is similar to the outer one except in 

 being slightly longer and curving inwards so as to cross the inner 

 ramus of the other side. 



Gravid Fenuile.—l\\ a female, with fully developed incubatory 

 pouch, measuring 12 mm. long, the pouch occupies' an area under 

 the first to the fifth free segments of the pereion, and reaches 

 ventrally to near the distal extremity of the ischios of the third 

 pereiopod. In outline the anterior, posterior, and ventral 

 margins are deeply convex. It is formed of three pairs of thin 

 transparent lamellae (oostegites) produced from the inside of the 

 basal joint of the antipenultimate and succeeding two pairs of 

 pereiopods, which overlap each other along the lateral borders, 

 and incurve ventrally to overlap those of the opposite side, and 

 so form a spacious pouch, containing about twenty light yellow- 



